1 /* 2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 * 14 * Changes: 15 * Roger Venning <r.venning@telstra.com>: 6to4 support 16 * Nate Thompson <nate@thebog.net>: 6to4 support 17 * Fred Templin <fred.l.templin@boeing.com>: isatap support 18 */ 19 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 22 #include <linux/module.h> 23 #include <linux/capability.h> 24 #include <linux/errno.h> 25 #include <linux/types.h> 26 #include <linux/socket.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/in6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/icmp.h> 33 #include <linux/slab.h> 34 #include <asm/uaccess.h> 35 #include <linux/init.h> 36 #include <linux/netfilter_ipv4.h> 37 #include <linux/if_ether.h> 38 39 #include <net/sock.h> 40 #include <net/snmp.h> 41 42 #include <net/ipv6.h> 43 #include <net/protocol.h> 44 #include <net/transp_v6.h> 45 #include <net/ip6_fib.h> 46 #include <net/ip6_route.h> 47 #include <net/ndisc.h> 48 #include <net/addrconf.h> 49 #include <net/ip.h> 50 #include <net/udp.h> 51 #include <net/icmp.h> 52 #include <net/ipip.h> 53 #include <net/inet_ecn.h> 54 #include <net/xfrm.h> 55 #include <net/dsfield.h> 56 #include <net/net_namespace.h> 57 #include <net/netns/generic.h> 58 59 /* 60 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c 61 62 For comments look at net/ipv4/ip_gre.c --ANK 63 */ 64 65 #define HASH_SIZE 16 66 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) 67 68 static bool log_ecn_error = true; 69 module_param(log_ecn_error, bool, 0644); 70 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 71 72 static int ipip6_tunnel_init(struct net_device *dev); 73 static void ipip6_tunnel_setup(struct net_device *dev); 74 static void ipip6_dev_free(struct net_device *dev); 75 static struct rtnl_link_ops sit_link_ops __read_mostly; 76 77 static int sit_net_id __read_mostly; 78 struct sit_net { 79 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; 80 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; 81 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; 82 struct ip_tunnel __rcu *tunnels_wc[1]; 83 struct ip_tunnel __rcu **tunnels[4]; 84 85 struct net_device *fb_tunnel_dev; 86 }; 87 88 static struct rtnl_link_stats64 *ipip6_get_stats64(struct net_device *dev, 89 struct rtnl_link_stats64 *tot) 90 { 91 int i; 92 93 for_each_possible_cpu(i) { 94 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); 95 u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 96 unsigned int start; 97 98 do { 99 start = u64_stats_fetch_begin_bh(&tstats->syncp); 100 rx_packets = tstats->rx_packets; 101 tx_packets = tstats->tx_packets; 102 rx_bytes = tstats->rx_bytes; 103 tx_bytes = tstats->tx_bytes; 104 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); 105 106 tot->rx_packets += rx_packets; 107 tot->tx_packets += tx_packets; 108 tot->rx_bytes += rx_bytes; 109 tot->tx_bytes += tx_bytes; 110 } 111 112 tot->rx_errors = dev->stats.rx_errors; 113 tot->rx_frame_errors = dev->stats.rx_frame_errors; 114 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 115 tot->tx_carrier_errors = dev->stats.tx_carrier_errors; 116 tot->tx_dropped = dev->stats.tx_dropped; 117 tot->tx_aborted_errors = dev->stats.tx_aborted_errors; 118 tot->tx_errors = dev->stats.tx_errors; 119 120 return tot; 121 } 122 123 /* 124 * Must be invoked with rcu_read_lock 125 */ 126 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, 127 struct net_device *dev, __be32 remote, __be32 local) 128 { 129 unsigned int h0 = HASH(remote); 130 unsigned int h1 = HASH(local); 131 struct ip_tunnel *t; 132 struct sit_net *sitn = net_generic(net, sit_net_id); 133 134 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { 135 if (local == t->parms.iph.saddr && 136 remote == t->parms.iph.daddr && 137 (!dev || !t->parms.link || dev->iflink == t->parms.link) && 138 (t->dev->flags & IFF_UP)) 139 return t; 140 } 141 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { 142 if (remote == t->parms.iph.daddr && 143 (!dev || !t->parms.link || dev->iflink == t->parms.link) && 144 (t->dev->flags & IFF_UP)) 145 return t; 146 } 147 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { 148 if (local == t->parms.iph.saddr && 149 (!dev || !t->parms.link || dev->iflink == t->parms.link) && 150 (t->dev->flags & IFF_UP)) 151 return t; 152 } 153 t = rcu_dereference(sitn->tunnels_wc[0]); 154 if ((t != NULL) && (t->dev->flags & IFF_UP)) 155 return t; 156 return NULL; 157 } 158 159 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, 160 struct ip_tunnel_parm *parms) 161 { 162 __be32 remote = parms->iph.daddr; 163 __be32 local = parms->iph.saddr; 164 unsigned int h = 0; 165 int prio = 0; 166 167 if (remote) { 168 prio |= 2; 169 h ^= HASH(remote); 170 } 171 if (local) { 172 prio |= 1; 173 h ^= HASH(local); 174 } 175 return &sitn->tunnels[prio][h]; 176 } 177 178 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, 179 struct ip_tunnel *t) 180 { 181 return __ipip6_bucket(sitn, &t->parms); 182 } 183 184 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) 185 { 186 struct ip_tunnel __rcu **tp; 187 struct ip_tunnel *iter; 188 189 for (tp = ipip6_bucket(sitn, t); 190 (iter = rtnl_dereference(*tp)) != NULL; 191 tp = &iter->next) { 192 if (t == iter) { 193 rcu_assign_pointer(*tp, t->next); 194 break; 195 } 196 } 197 } 198 199 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) 200 { 201 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); 202 203 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 204 rcu_assign_pointer(*tp, t); 205 } 206 207 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) 208 { 209 #ifdef CONFIG_IPV6_SIT_6RD 210 struct ip_tunnel *t = netdev_priv(dev); 211 212 if (t->dev == sitn->fb_tunnel_dev) { 213 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); 214 t->ip6rd.relay_prefix = 0; 215 t->ip6rd.prefixlen = 16; 216 t->ip6rd.relay_prefixlen = 0; 217 } else { 218 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); 219 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); 220 } 221 #endif 222 } 223 224 static int ipip6_tunnel_create(struct net_device *dev) 225 { 226 struct ip_tunnel *t = netdev_priv(dev); 227 struct net *net = dev_net(dev); 228 struct sit_net *sitn = net_generic(net, sit_net_id); 229 int err; 230 231 err = ipip6_tunnel_init(dev); 232 if (err < 0) 233 goto out; 234 ipip6_tunnel_clone_6rd(dev, sitn); 235 236 if ((__force u16)t->parms.i_flags & SIT_ISATAP) 237 dev->priv_flags |= IFF_ISATAP; 238 239 err = register_netdevice(dev); 240 if (err < 0) 241 goto out; 242 243 strcpy(t->parms.name, dev->name); 244 dev->rtnl_link_ops = &sit_link_ops; 245 246 dev_hold(dev); 247 248 ipip6_tunnel_link(sitn, t); 249 return 0; 250 251 out: 252 return err; 253 } 254 255 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, 256 struct ip_tunnel_parm *parms, int create) 257 { 258 __be32 remote = parms->iph.daddr; 259 __be32 local = parms->iph.saddr; 260 struct ip_tunnel *t, *nt; 261 struct ip_tunnel __rcu **tp; 262 struct net_device *dev; 263 char name[IFNAMSIZ]; 264 struct sit_net *sitn = net_generic(net, sit_net_id); 265 266 for (tp = __ipip6_bucket(sitn, parms); 267 (t = rtnl_dereference(*tp)) != NULL; 268 tp = &t->next) { 269 if (local == t->parms.iph.saddr && 270 remote == t->parms.iph.daddr && 271 parms->link == t->parms.link) { 272 if (create) 273 return NULL; 274 else 275 return t; 276 } 277 } 278 if (!create) 279 goto failed; 280 281 if (parms->name[0]) 282 strlcpy(name, parms->name, IFNAMSIZ); 283 else 284 strcpy(name, "sit%d"); 285 286 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); 287 if (dev == NULL) 288 return NULL; 289 290 dev_net_set(dev, net); 291 292 nt = netdev_priv(dev); 293 294 nt->parms = *parms; 295 if (ipip6_tunnel_create(dev) < 0) 296 goto failed_free; 297 298 return nt; 299 300 failed_free: 301 ipip6_dev_free(dev); 302 failed: 303 return NULL; 304 } 305 306 #define for_each_prl_rcu(start) \ 307 for (prl = rcu_dereference(start); \ 308 prl; \ 309 prl = rcu_dereference(prl->next)) 310 311 static struct ip_tunnel_prl_entry * 312 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 313 { 314 struct ip_tunnel_prl_entry *prl; 315 316 for_each_prl_rcu(t->prl) 317 if (prl->addr == addr) 318 break; 319 return prl; 320 321 } 322 323 static int ipip6_tunnel_get_prl(struct ip_tunnel *t, 324 struct ip_tunnel_prl __user *a) 325 { 326 struct ip_tunnel_prl kprl, *kp; 327 struct ip_tunnel_prl_entry *prl; 328 unsigned int cmax, c = 0, ca, len; 329 int ret = 0; 330 331 if (copy_from_user(&kprl, a, sizeof(kprl))) 332 return -EFAULT; 333 cmax = kprl.datalen / sizeof(kprl); 334 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) 335 cmax = 1; 336 337 /* For simple GET or for root users, 338 * we try harder to allocate. 339 */ 340 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? 341 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : 342 NULL; 343 344 rcu_read_lock(); 345 346 ca = t->prl_count < cmax ? t->prl_count : cmax; 347 348 if (!kp) { 349 /* We don't try hard to allocate much memory for 350 * non-root users. 351 * For root users, retry allocating enough memory for 352 * the answer. 353 */ 354 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); 355 if (!kp) { 356 ret = -ENOMEM; 357 goto out; 358 } 359 } 360 361 c = 0; 362 for_each_prl_rcu(t->prl) { 363 if (c >= cmax) 364 break; 365 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 366 continue; 367 kp[c].addr = prl->addr; 368 kp[c].flags = prl->flags; 369 c++; 370 if (kprl.addr != htonl(INADDR_ANY)) 371 break; 372 } 373 out: 374 rcu_read_unlock(); 375 376 len = sizeof(*kp) * c; 377 ret = 0; 378 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 379 ret = -EFAULT; 380 381 kfree(kp); 382 383 return ret; 384 } 385 386 static int 387 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 388 { 389 struct ip_tunnel_prl_entry *p; 390 int err = 0; 391 392 if (a->addr == htonl(INADDR_ANY)) 393 return -EINVAL; 394 395 ASSERT_RTNL(); 396 397 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 398 if (p->addr == a->addr) { 399 if (chg) { 400 p->flags = a->flags; 401 goto out; 402 } 403 err = -EEXIST; 404 goto out; 405 } 406 } 407 408 if (chg) { 409 err = -ENXIO; 410 goto out; 411 } 412 413 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 414 if (!p) { 415 err = -ENOBUFS; 416 goto out; 417 } 418 419 p->next = t->prl; 420 p->addr = a->addr; 421 p->flags = a->flags; 422 t->prl_count++; 423 rcu_assign_pointer(t->prl, p); 424 out: 425 return err; 426 } 427 428 static void prl_list_destroy_rcu(struct rcu_head *head) 429 { 430 struct ip_tunnel_prl_entry *p, *n; 431 432 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 433 do { 434 n = rcu_dereference_protected(p->next, 1); 435 kfree(p); 436 p = n; 437 } while (p); 438 } 439 440 static int 441 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 442 { 443 struct ip_tunnel_prl_entry *x; 444 struct ip_tunnel_prl_entry __rcu **p; 445 int err = 0; 446 447 ASSERT_RTNL(); 448 449 if (a && a->addr != htonl(INADDR_ANY)) { 450 for (p = &t->prl; 451 (x = rtnl_dereference(*p)) != NULL; 452 p = &x->next) { 453 if (x->addr == a->addr) { 454 *p = x->next; 455 kfree_rcu(x, rcu_head); 456 t->prl_count--; 457 goto out; 458 } 459 } 460 err = -ENXIO; 461 } else { 462 x = rtnl_dereference(t->prl); 463 if (x) { 464 t->prl_count = 0; 465 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 466 t->prl = NULL; 467 } 468 } 469 out: 470 return err; 471 } 472 473 static int 474 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 475 { 476 struct ip_tunnel_prl_entry *p; 477 int ok = 1; 478 479 rcu_read_lock(); 480 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 481 if (p) { 482 if (p->flags & PRL_DEFAULT) 483 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 484 else 485 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 486 } else { 487 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 488 489 if (ipv6_addr_is_isatap(addr6) && 490 (addr6->s6_addr32[3] == iph->saddr) && 491 ipv6_chk_prefix(addr6, t->dev)) 492 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 493 else 494 ok = 0; 495 } 496 rcu_read_unlock(); 497 return ok; 498 } 499 500 static void ipip6_tunnel_uninit(struct net_device *dev) 501 { 502 struct net *net = dev_net(dev); 503 struct sit_net *sitn = net_generic(net, sit_net_id); 504 505 if (dev == sitn->fb_tunnel_dev) { 506 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 507 } else { 508 ipip6_tunnel_unlink(sitn, netdev_priv(dev)); 509 ipip6_tunnel_del_prl(netdev_priv(dev), NULL); 510 } 511 dev_put(dev); 512 } 513 514 515 static int ipip6_err(struct sk_buff *skb, u32 info) 516 { 517 518 /* All the routers (except for Linux) return only 519 8 bytes of packet payload. It means, that precise relaying of 520 ICMP in the real Internet is absolutely infeasible. 521 */ 522 const struct iphdr *iph = (const struct iphdr *)skb->data; 523 const int type = icmp_hdr(skb)->type; 524 const int code = icmp_hdr(skb)->code; 525 struct ip_tunnel *t; 526 int err; 527 528 switch (type) { 529 default: 530 case ICMP_PARAMETERPROB: 531 return 0; 532 533 case ICMP_DEST_UNREACH: 534 switch (code) { 535 case ICMP_SR_FAILED: 536 case ICMP_PORT_UNREACH: 537 /* Impossible event. */ 538 return 0; 539 default: 540 /* All others are translated to HOST_UNREACH. 541 rfc2003 contains "deep thoughts" about NET_UNREACH, 542 I believe they are just ether pollution. --ANK 543 */ 544 break; 545 } 546 break; 547 case ICMP_TIME_EXCEEDED: 548 if (code != ICMP_EXC_TTL) 549 return 0; 550 break; 551 case ICMP_REDIRECT: 552 break; 553 } 554 555 err = -ENOENT; 556 557 t = ipip6_tunnel_lookup(dev_net(skb->dev), 558 skb->dev, 559 iph->daddr, 560 iph->saddr); 561 if (t == NULL) 562 goto out; 563 564 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 565 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 566 t->dev->ifindex, 0, IPPROTO_IPV6, 0); 567 err = 0; 568 goto out; 569 } 570 if (type == ICMP_REDIRECT) { 571 ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, 572 IPPROTO_IPV6, 0); 573 err = 0; 574 goto out; 575 } 576 577 if (t->parms.iph.daddr == 0) 578 goto out; 579 580 err = 0; 581 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 582 goto out; 583 584 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 585 t->err_count++; 586 else 587 t->err_count = 1; 588 t->err_time = jiffies; 589 out: 590 return err; 591 } 592 593 static int ipip6_rcv(struct sk_buff *skb) 594 { 595 const struct iphdr *iph; 596 struct ip_tunnel *tunnel; 597 int err; 598 599 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 600 goto out; 601 602 iph = ip_hdr(skb); 603 604 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 605 iph->saddr, iph->daddr); 606 if (tunnel != NULL) { 607 struct pcpu_tstats *tstats; 608 609 secpath_reset(skb); 610 skb->mac_header = skb->network_header; 611 skb_reset_network_header(skb); 612 IPCB(skb)->flags = 0; 613 skb->protocol = htons(ETH_P_IPV6); 614 skb->pkt_type = PACKET_HOST; 615 616 if ((tunnel->dev->priv_flags & IFF_ISATAP) && 617 !isatap_chksrc(skb, iph, tunnel)) { 618 tunnel->dev->stats.rx_errors++; 619 goto out; 620 } 621 622 __skb_tunnel_rx(skb, tunnel->dev); 623 624 err = IP_ECN_decapsulate(iph, skb); 625 if (unlikely(err)) { 626 if (log_ecn_error) 627 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 628 &iph->saddr, iph->tos); 629 if (err > 1) { 630 ++tunnel->dev->stats.rx_frame_errors; 631 ++tunnel->dev->stats.rx_errors; 632 goto out; 633 } 634 } 635 636 tstats = this_cpu_ptr(tunnel->dev->tstats); 637 tstats->rx_packets++; 638 tstats->rx_bytes += skb->len; 639 640 netif_rx(skb); 641 642 return 0; 643 } 644 645 /* no tunnel matched, let upstream know, ipsec may handle it */ 646 return 1; 647 out: 648 kfree_skb(skb); 649 return 0; 650 } 651 652 /* 653 * Returns the embedded IPv4 address if the IPv6 address 654 * comes from 6rd / 6to4 (RFC 3056) addr space. 655 */ 656 static inline 657 __be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel) 658 { 659 __be32 dst = 0; 660 661 #ifdef CONFIG_IPV6_SIT_6RD 662 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 663 tunnel->ip6rd.prefixlen)) { 664 unsigned int pbw0, pbi0; 665 int pbi1; 666 u32 d; 667 668 pbw0 = tunnel->ip6rd.prefixlen >> 5; 669 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 670 671 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 672 tunnel->ip6rd.relay_prefixlen; 673 674 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 675 if (pbi1 > 0) 676 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 677 (32 - pbi1); 678 679 dst = tunnel->ip6rd.relay_prefix | htonl(d); 680 } 681 #else 682 if (v6dst->s6_addr16[0] == htons(0x2002)) { 683 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 684 memcpy(&dst, &v6dst->s6_addr16[1], 4); 685 } 686 #endif 687 return dst; 688 } 689 690 /* 691 * This function assumes it is being called from dev_queue_xmit() 692 * and that skb is filled properly by that function. 693 */ 694 695 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 696 struct net_device *dev) 697 { 698 struct ip_tunnel *tunnel = netdev_priv(dev); 699 const struct iphdr *tiph = &tunnel->parms.iph; 700 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 701 u8 tos = tunnel->parms.iph.tos; 702 __be16 df = tiph->frag_off; 703 struct rtable *rt; /* Route to the other host */ 704 struct net_device *tdev; /* Device to other host */ 705 struct iphdr *iph; /* Our new IP header */ 706 unsigned int max_headroom; /* The extra header space needed */ 707 __be32 dst = tiph->daddr; 708 struct flowi4 fl4; 709 int mtu; 710 const struct in6_addr *addr6; 711 int addr_type; 712 713 if (skb->protocol != htons(ETH_P_IPV6)) 714 goto tx_error; 715 716 if (tos == 1) 717 tos = ipv6_get_dsfield(iph6); 718 719 /* ISATAP (RFC4214) - must come before 6to4 */ 720 if (dev->priv_flags & IFF_ISATAP) { 721 struct neighbour *neigh = NULL; 722 bool do_tx_error = false; 723 724 if (skb_dst(skb)) 725 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 726 727 if (neigh == NULL) { 728 net_dbg_ratelimited("sit: nexthop == NULL\n"); 729 goto tx_error; 730 } 731 732 addr6 = (const struct in6_addr *)&neigh->primary_key; 733 addr_type = ipv6_addr_type(addr6); 734 735 if ((addr_type & IPV6_ADDR_UNICAST) && 736 ipv6_addr_is_isatap(addr6)) 737 dst = addr6->s6_addr32[3]; 738 else 739 do_tx_error = true; 740 741 neigh_release(neigh); 742 if (do_tx_error) 743 goto tx_error; 744 } 745 746 if (!dst) 747 dst = try_6rd(&iph6->daddr, tunnel); 748 749 if (!dst) { 750 struct neighbour *neigh = NULL; 751 bool do_tx_error = false; 752 753 if (skb_dst(skb)) 754 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 755 756 if (neigh == NULL) { 757 net_dbg_ratelimited("sit: nexthop == NULL\n"); 758 goto tx_error; 759 } 760 761 addr6 = (const struct in6_addr *)&neigh->primary_key; 762 addr_type = ipv6_addr_type(addr6); 763 764 if (addr_type == IPV6_ADDR_ANY) { 765 addr6 = &ipv6_hdr(skb)->daddr; 766 addr_type = ipv6_addr_type(addr6); 767 } 768 769 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 770 dst = addr6->s6_addr32[3]; 771 else 772 do_tx_error = true; 773 774 neigh_release(neigh); 775 if (do_tx_error) 776 goto tx_error; 777 } 778 779 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, 780 dst, tiph->saddr, 781 0, 0, 782 IPPROTO_IPV6, RT_TOS(tos), 783 tunnel->parms.link); 784 if (IS_ERR(rt)) { 785 dev->stats.tx_carrier_errors++; 786 goto tx_error_icmp; 787 } 788 if (rt->rt_type != RTN_UNICAST) { 789 ip_rt_put(rt); 790 dev->stats.tx_carrier_errors++; 791 goto tx_error_icmp; 792 } 793 tdev = rt->dst.dev; 794 795 if (tdev == dev) { 796 ip_rt_put(rt); 797 dev->stats.collisions++; 798 goto tx_error; 799 } 800 801 if (df) { 802 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); 803 804 if (mtu < 68) { 805 dev->stats.collisions++; 806 ip_rt_put(rt); 807 goto tx_error; 808 } 809 810 if (mtu < IPV6_MIN_MTU) { 811 mtu = IPV6_MIN_MTU; 812 df = 0; 813 } 814 815 if (tunnel->parms.iph.daddr && skb_dst(skb)) 816 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 817 818 if (skb->len > mtu) { 819 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 820 ip_rt_put(rt); 821 goto tx_error; 822 } 823 } 824 825 if (tunnel->err_count > 0) { 826 if (time_before(jiffies, 827 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 828 tunnel->err_count--; 829 dst_link_failure(skb); 830 } else 831 tunnel->err_count = 0; 832 } 833 834 /* 835 * Okay, now see if we can stuff it in the buffer as-is. 836 */ 837 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); 838 839 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 840 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 841 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 842 if (!new_skb) { 843 ip_rt_put(rt); 844 dev->stats.tx_dropped++; 845 dev_kfree_skb(skb); 846 return NETDEV_TX_OK; 847 } 848 if (skb->sk) 849 skb_set_owner_w(new_skb, skb->sk); 850 dev_kfree_skb(skb); 851 skb = new_skb; 852 iph6 = ipv6_hdr(skb); 853 } 854 855 skb->transport_header = skb->network_header; 856 skb_push(skb, sizeof(struct iphdr)); 857 skb_reset_network_header(skb); 858 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 859 IPCB(skb)->flags = 0; 860 skb_dst_drop(skb); 861 skb_dst_set(skb, &rt->dst); 862 863 /* 864 * Push down and install the IPIP header. 865 */ 866 867 iph = ip_hdr(skb); 868 iph->version = 4; 869 iph->ihl = sizeof(struct iphdr)>>2; 870 iph->frag_off = df; 871 iph->protocol = IPPROTO_IPV6; 872 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 873 iph->daddr = fl4.daddr; 874 iph->saddr = fl4.saddr; 875 876 if ((iph->ttl = tiph->ttl) == 0) 877 iph->ttl = iph6->hop_limit; 878 879 iptunnel_xmit(skb, dev); 880 return NETDEV_TX_OK; 881 882 tx_error_icmp: 883 dst_link_failure(skb); 884 tx_error: 885 dev->stats.tx_errors++; 886 dev_kfree_skb(skb); 887 return NETDEV_TX_OK; 888 } 889 890 static void ipip6_tunnel_bind_dev(struct net_device *dev) 891 { 892 struct net_device *tdev = NULL; 893 struct ip_tunnel *tunnel; 894 const struct iphdr *iph; 895 struct flowi4 fl4; 896 897 tunnel = netdev_priv(dev); 898 iph = &tunnel->parms.iph; 899 900 if (iph->daddr) { 901 struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, 902 iph->daddr, iph->saddr, 903 0, 0, 904 IPPROTO_IPV6, 905 RT_TOS(iph->tos), 906 tunnel->parms.link); 907 908 if (!IS_ERR(rt)) { 909 tdev = rt->dst.dev; 910 ip_rt_put(rt); 911 } 912 dev->flags |= IFF_POINTOPOINT; 913 } 914 915 if (!tdev && tunnel->parms.link) 916 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); 917 918 if (tdev) { 919 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); 920 dev->mtu = tdev->mtu - sizeof(struct iphdr); 921 if (dev->mtu < IPV6_MIN_MTU) 922 dev->mtu = IPV6_MIN_MTU; 923 } 924 dev->iflink = tunnel->parms.link; 925 } 926 927 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p) 928 { 929 struct net *net = dev_net(t->dev); 930 struct sit_net *sitn = net_generic(net, sit_net_id); 931 932 ipip6_tunnel_unlink(sitn, t); 933 synchronize_net(); 934 t->parms.iph.saddr = p->iph.saddr; 935 t->parms.iph.daddr = p->iph.daddr; 936 memcpy(t->dev->dev_addr, &p->iph.saddr, 4); 937 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 938 ipip6_tunnel_link(sitn, t); 939 t->parms.iph.ttl = p->iph.ttl; 940 t->parms.iph.tos = p->iph.tos; 941 if (t->parms.link != p->link) { 942 t->parms.link = p->link; 943 ipip6_tunnel_bind_dev(t->dev); 944 } 945 netdev_state_change(t->dev); 946 } 947 948 #ifdef CONFIG_IPV6_SIT_6RD 949 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 950 struct ip_tunnel_6rd *ip6rd) 951 { 952 struct in6_addr prefix; 953 __be32 relay_prefix; 954 955 if (ip6rd->relay_prefixlen > 32 || 956 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 957 return -EINVAL; 958 959 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 960 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 961 return -EINVAL; 962 if (ip6rd->relay_prefixlen) 963 relay_prefix = ip6rd->relay_prefix & 964 htonl(0xffffffffUL << 965 (32 - ip6rd->relay_prefixlen)); 966 else 967 relay_prefix = 0; 968 if (relay_prefix != ip6rd->relay_prefix) 969 return -EINVAL; 970 971 t->ip6rd.prefix = prefix; 972 t->ip6rd.relay_prefix = relay_prefix; 973 t->ip6rd.prefixlen = ip6rd->prefixlen; 974 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 975 netdev_state_change(t->dev); 976 return 0; 977 } 978 #endif 979 980 static int 981 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) 982 { 983 int err = 0; 984 struct ip_tunnel_parm p; 985 struct ip_tunnel_prl prl; 986 struct ip_tunnel *t; 987 struct net *net = dev_net(dev); 988 struct sit_net *sitn = net_generic(net, sit_net_id); 989 #ifdef CONFIG_IPV6_SIT_6RD 990 struct ip_tunnel_6rd ip6rd; 991 #endif 992 993 switch (cmd) { 994 case SIOCGETTUNNEL: 995 #ifdef CONFIG_IPV6_SIT_6RD 996 case SIOCGET6RD: 997 #endif 998 t = NULL; 999 if (dev == sitn->fb_tunnel_dev) { 1000 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1001 err = -EFAULT; 1002 break; 1003 } 1004 t = ipip6_tunnel_locate(net, &p, 0); 1005 } 1006 if (t == NULL) 1007 t = netdev_priv(dev); 1008 1009 err = -EFAULT; 1010 if (cmd == SIOCGETTUNNEL) { 1011 memcpy(&p, &t->parms, sizeof(p)); 1012 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, 1013 sizeof(p))) 1014 goto done; 1015 #ifdef CONFIG_IPV6_SIT_6RD 1016 } else { 1017 ip6rd.prefix = t->ip6rd.prefix; 1018 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1019 ip6rd.prefixlen = t->ip6rd.prefixlen; 1020 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1021 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, 1022 sizeof(ip6rd))) 1023 goto done; 1024 #endif 1025 } 1026 err = 0; 1027 break; 1028 1029 case SIOCADDTUNNEL: 1030 case SIOCCHGTUNNEL: 1031 err = -EPERM; 1032 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1033 goto done; 1034 1035 err = -EFAULT; 1036 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1037 goto done; 1038 1039 err = -EINVAL; 1040 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || 1041 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) 1042 goto done; 1043 if (p.iph.ttl) 1044 p.iph.frag_off |= htons(IP_DF); 1045 1046 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); 1047 1048 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1049 if (t != NULL) { 1050 if (t->dev != dev) { 1051 err = -EEXIST; 1052 break; 1053 } 1054 } else { 1055 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || 1056 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { 1057 err = -EINVAL; 1058 break; 1059 } 1060 t = netdev_priv(dev); 1061 } 1062 1063 ipip6_tunnel_update(t, &p); 1064 } 1065 1066 if (t) { 1067 err = 0; 1068 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) 1069 err = -EFAULT; 1070 } else 1071 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1072 break; 1073 1074 case SIOCDELTUNNEL: 1075 err = -EPERM; 1076 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1077 goto done; 1078 1079 if (dev == sitn->fb_tunnel_dev) { 1080 err = -EFAULT; 1081 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1082 goto done; 1083 err = -ENOENT; 1084 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) 1085 goto done; 1086 err = -EPERM; 1087 if (t == netdev_priv(sitn->fb_tunnel_dev)) 1088 goto done; 1089 dev = t->dev; 1090 } 1091 unregister_netdevice(dev); 1092 err = 0; 1093 break; 1094 1095 case SIOCGETPRL: 1096 err = -EINVAL; 1097 if (dev == sitn->fb_tunnel_dev) 1098 goto done; 1099 err = -ENOENT; 1100 if (!(t = netdev_priv(dev))) 1101 goto done; 1102 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); 1103 break; 1104 1105 case SIOCADDPRL: 1106 case SIOCDELPRL: 1107 case SIOCCHGPRL: 1108 err = -EPERM; 1109 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1110 goto done; 1111 err = -EINVAL; 1112 if (dev == sitn->fb_tunnel_dev) 1113 goto done; 1114 err = -EFAULT; 1115 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) 1116 goto done; 1117 err = -ENOENT; 1118 if (!(t = netdev_priv(dev))) 1119 goto done; 1120 1121 switch (cmd) { 1122 case SIOCDELPRL: 1123 err = ipip6_tunnel_del_prl(t, &prl); 1124 break; 1125 case SIOCADDPRL: 1126 case SIOCCHGPRL: 1127 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 1128 break; 1129 } 1130 netdev_state_change(dev); 1131 break; 1132 1133 #ifdef CONFIG_IPV6_SIT_6RD 1134 case SIOCADD6RD: 1135 case SIOCCHG6RD: 1136 case SIOCDEL6RD: 1137 err = -EPERM; 1138 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1139 goto done; 1140 1141 err = -EFAULT; 1142 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, 1143 sizeof(ip6rd))) 1144 goto done; 1145 1146 t = netdev_priv(dev); 1147 1148 if (cmd != SIOCDEL6RD) { 1149 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1150 if (err < 0) 1151 goto done; 1152 } else 1153 ipip6_tunnel_clone_6rd(dev, sitn); 1154 1155 err = 0; 1156 break; 1157 #endif 1158 1159 default: 1160 err = -EINVAL; 1161 } 1162 1163 done: 1164 return err; 1165 } 1166 1167 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) 1168 { 1169 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) 1170 return -EINVAL; 1171 dev->mtu = new_mtu; 1172 return 0; 1173 } 1174 1175 static const struct net_device_ops ipip6_netdev_ops = { 1176 .ndo_uninit = ipip6_tunnel_uninit, 1177 .ndo_start_xmit = ipip6_tunnel_xmit, 1178 .ndo_do_ioctl = ipip6_tunnel_ioctl, 1179 .ndo_change_mtu = ipip6_tunnel_change_mtu, 1180 .ndo_get_stats64= ipip6_get_stats64, 1181 }; 1182 1183 static void ipip6_dev_free(struct net_device *dev) 1184 { 1185 free_percpu(dev->tstats); 1186 free_netdev(dev); 1187 } 1188 1189 static void ipip6_tunnel_setup(struct net_device *dev) 1190 { 1191 dev->netdev_ops = &ipip6_netdev_ops; 1192 dev->destructor = ipip6_dev_free; 1193 1194 dev->type = ARPHRD_SIT; 1195 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); 1196 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); 1197 dev->flags = IFF_NOARP; 1198 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1199 dev->iflink = 0; 1200 dev->addr_len = 4; 1201 dev->features |= NETIF_F_NETNS_LOCAL; 1202 dev->features |= NETIF_F_LLTX; 1203 } 1204 1205 static int ipip6_tunnel_init(struct net_device *dev) 1206 { 1207 struct ip_tunnel *tunnel = netdev_priv(dev); 1208 1209 tunnel->dev = dev; 1210 1211 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); 1212 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); 1213 1214 ipip6_tunnel_bind_dev(dev); 1215 dev->tstats = alloc_percpu(struct pcpu_tstats); 1216 if (!dev->tstats) 1217 return -ENOMEM; 1218 1219 return 0; 1220 } 1221 1222 static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1223 { 1224 struct ip_tunnel *tunnel = netdev_priv(dev); 1225 struct iphdr *iph = &tunnel->parms.iph; 1226 struct net *net = dev_net(dev); 1227 struct sit_net *sitn = net_generic(net, sit_net_id); 1228 1229 tunnel->dev = dev; 1230 strcpy(tunnel->parms.name, dev->name); 1231 1232 iph->version = 4; 1233 iph->protocol = IPPROTO_IPV6; 1234 iph->ihl = 5; 1235 iph->ttl = 64; 1236 1237 dev->tstats = alloc_percpu(struct pcpu_tstats); 1238 if (!dev->tstats) 1239 return -ENOMEM; 1240 dev_hold(dev); 1241 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1242 return 0; 1243 } 1244 1245 static void ipip6_netlink_parms(struct nlattr *data[], 1246 struct ip_tunnel_parm *parms) 1247 { 1248 memset(parms, 0, sizeof(*parms)); 1249 1250 parms->iph.version = 4; 1251 parms->iph.protocol = IPPROTO_IPV6; 1252 parms->iph.ihl = 5; 1253 parms->iph.ttl = 64; 1254 1255 if (!data) 1256 return; 1257 1258 if (data[IFLA_IPTUN_LINK]) 1259 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1260 1261 if (data[IFLA_IPTUN_LOCAL]) 1262 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1263 1264 if (data[IFLA_IPTUN_REMOTE]) 1265 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1266 1267 if (data[IFLA_IPTUN_TTL]) { 1268 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1269 if (parms->iph.ttl) 1270 parms->iph.frag_off = htons(IP_DF); 1271 } 1272 1273 if (data[IFLA_IPTUN_TOS]) 1274 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1275 1276 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1277 parms->iph.frag_off = htons(IP_DF); 1278 1279 if (data[IFLA_IPTUN_FLAGS]) 1280 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1281 } 1282 1283 #ifdef CONFIG_IPV6_SIT_6RD 1284 /* This function returns true when 6RD attributes are present in the nl msg */ 1285 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1286 struct ip_tunnel_6rd *ip6rd) 1287 { 1288 bool ret = false; 1289 memset(ip6rd, 0, sizeof(*ip6rd)); 1290 1291 if (!data) 1292 return ret; 1293 1294 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1295 ret = true; 1296 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX], 1297 sizeof(struct in6_addr)); 1298 } 1299 1300 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1301 ret = true; 1302 ip6rd->relay_prefix = 1303 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1304 } 1305 1306 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1307 ret = true; 1308 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1309 } 1310 1311 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1312 ret = true; 1313 ip6rd->relay_prefixlen = 1314 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1315 } 1316 1317 return ret; 1318 } 1319 #endif 1320 1321 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1322 struct nlattr *tb[], struct nlattr *data[]) 1323 { 1324 struct net *net = dev_net(dev); 1325 struct ip_tunnel *nt; 1326 #ifdef CONFIG_IPV6_SIT_6RD 1327 struct ip_tunnel_6rd ip6rd; 1328 #endif 1329 int err; 1330 1331 nt = netdev_priv(dev); 1332 ipip6_netlink_parms(data, &nt->parms); 1333 1334 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1335 return -EEXIST; 1336 1337 err = ipip6_tunnel_create(dev); 1338 if (err < 0) 1339 return err; 1340 1341 #ifdef CONFIG_IPV6_SIT_6RD 1342 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1343 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1344 #endif 1345 1346 return err; 1347 } 1348 1349 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1350 struct nlattr *data[]) 1351 { 1352 struct ip_tunnel *t; 1353 struct ip_tunnel_parm p; 1354 struct net *net = dev_net(dev); 1355 struct sit_net *sitn = net_generic(net, sit_net_id); 1356 #ifdef CONFIG_IPV6_SIT_6RD 1357 struct ip_tunnel_6rd ip6rd; 1358 #endif 1359 1360 if (dev == sitn->fb_tunnel_dev) 1361 return -EINVAL; 1362 1363 ipip6_netlink_parms(data, &p); 1364 1365 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1366 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1367 return -EINVAL; 1368 1369 t = ipip6_tunnel_locate(net, &p, 0); 1370 1371 if (t) { 1372 if (t->dev != dev) 1373 return -EEXIST; 1374 } else 1375 t = netdev_priv(dev); 1376 1377 ipip6_tunnel_update(t, &p); 1378 1379 #ifdef CONFIG_IPV6_SIT_6RD 1380 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1381 return ipip6_tunnel_update_6rd(t, &ip6rd); 1382 #endif 1383 1384 return 0; 1385 } 1386 1387 static size_t ipip6_get_size(const struct net_device *dev) 1388 { 1389 return 1390 /* IFLA_IPTUN_LINK */ 1391 nla_total_size(4) + 1392 /* IFLA_IPTUN_LOCAL */ 1393 nla_total_size(4) + 1394 /* IFLA_IPTUN_REMOTE */ 1395 nla_total_size(4) + 1396 /* IFLA_IPTUN_TTL */ 1397 nla_total_size(1) + 1398 /* IFLA_IPTUN_TOS */ 1399 nla_total_size(1) + 1400 /* IFLA_IPTUN_PMTUDISC */ 1401 nla_total_size(1) + 1402 /* IFLA_IPTUN_FLAGS */ 1403 nla_total_size(2) + 1404 #ifdef CONFIG_IPV6_SIT_6RD 1405 /* IFLA_IPTUN_6RD_PREFIX */ 1406 nla_total_size(sizeof(struct in6_addr)) + 1407 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1408 nla_total_size(4) + 1409 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1410 nla_total_size(2) + 1411 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1412 nla_total_size(2) + 1413 #endif 1414 0; 1415 } 1416 1417 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1418 { 1419 struct ip_tunnel *tunnel = netdev_priv(dev); 1420 struct ip_tunnel_parm *parm = &tunnel->parms; 1421 1422 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1423 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1424 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1425 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1426 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1427 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1428 !!(parm->iph.frag_off & htons(IP_DF))) || 1429 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags)) 1430 goto nla_put_failure; 1431 1432 #ifdef CONFIG_IPV6_SIT_6RD 1433 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr), 1434 &tunnel->ip6rd.prefix) || 1435 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1436 tunnel->ip6rd.relay_prefix) || 1437 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1438 tunnel->ip6rd.prefixlen) || 1439 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1440 tunnel->ip6rd.relay_prefixlen)) 1441 goto nla_put_failure; 1442 #endif 1443 1444 return 0; 1445 1446 nla_put_failure: 1447 return -EMSGSIZE; 1448 } 1449 1450 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1451 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1452 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1453 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1454 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1455 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1456 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1457 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1458 #ifdef CONFIG_IPV6_SIT_6RD 1459 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1460 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1461 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1462 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1463 #endif 1464 }; 1465 1466 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1467 .kind = "sit", 1468 .maxtype = IFLA_IPTUN_MAX, 1469 .policy = ipip6_policy, 1470 .priv_size = sizeof(struct ip_tunnel), 1471 .setup = ipip6_tunnel_setup, 1472 .newlink = ipip6_newlink, 1473 .changelink = ipip6_changelink, 1474 .get_size = ipip6_get_size, 1475 .fill_info = ipip6_fill_info, 1476 }; 1477 1478 static struct xfrm_tunnel sit_handler __read_mostly = { 1479 .handler = ipip6_rcv, 1480 .err_handler = ipip6_err, 1481 .priority = 1, 1482 }; 1483 1484 static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) 1485 { 1486 int prio; 1487 1488 for (prio = 1; prio < 4; prio++) { 1489 int h; 1490 for (h = 0; h < HASH_SIZE; h++) { 1491 struct ip_tunnel *t; 1492 1493 t = rtnl_dereference(sitn->tunnels[prio][h]); 1494 while (t != NULL) { 1495 unregister_netdevice_queue(t->dev, head); 1496 t = rtnl_dereference(t->next); 1497 } 1498 } 1499 } 1500 } 1501 1502 static int __net_init sit_init_net(struct net *net) 1503 { 1504 struct sit_net *sitn = net_generic(net, sit_net_id); 1505 struct ip_tunnel *t; 1506 int err; 1507 1508 sitn->tunnels[0] = sitn->tunnels_wc; 1509 sitn->tunnels[1] = sitn->tunnels_l; 1510 sitn->tunnels[2] = sitn->tunnels_r; 1511 sitn->tunnels[3] = sitn->tunnels_r_l; 1512 1513 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1514 ipip6_tunnel_setup); 1515 if (!sitn->fb_tunnel_dev) { 1516 err = -ENOMEM; 1517 goto err_alloc_dev; 1518 } 1519 dev_net_set(sitn->fb_tunnel_dev, net); 1520 1521 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1522 if (err) 1523 goto err_dev_free; 1524 1525 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1526 1527 if ((err = register_netdev(sitn->fb_tunnel_dev))) 1528 goto err_reg_dev; 1529 1530 t = netdev_priv(sitn->fb_tunnel_dev); 1531 1532 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1533 return 0; 1534 1535 err_reg_dev: 1536 dev_put(sitn->fb_tunnel_dev); 1537 err_dev_free: 1538 ipip6_dev_free(sitn->fb_tunnel_dev); 1539 err_alloc_dev: 1540 return err; 1541 } 1542 1543 static void __net_exit sit_exit_net(struct net *net) 1544 { 1545 struct sit_net *sitn = net_generic(net, sit_net_id); 1546 LIST_HEAD(list); 1547 1548 rtnl_lock(); 1549 sit_destroy_tunnels(sitn, &list); 1550 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); 1551 unregister_netdevice_many(&list); 1552 rtnl_unlock(); 1553 } 1554 1555 static struct pernet_operations sit_net_ops = { 1556 .init = sit_init_net, 1557 .exit = sit_exit_net, 1558 .id = &sit_net_id, 1559 .size = sizeof(struct sit_net), 1560 }; 1561 1562 static void __exit sit_cleanup(void) 1563 { 1564 rtnl_link_unregister(&sit_link_ops); 1565 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1566 1567 unregister_pernet_device(&sit_net_ops); 1568 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1569 } 1570 1571 static int __init sit_init(void) 1572 { 1573 int err; 1574 1575 pr_info("IPv6 over IPv4 tunneling driver\n"); 1576 1577 err = register_pernet_device(&sit_net_ops); 1578 if (err < 0) 1579 return err; 1580 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1581 if (err < 0) { 1582 pr_info("%s: can't add protocol\n", __func__); 1583 goto xfrm_tunnel_failed; 1584 } 1585 err = rtnl_link_register(&sit_link_ops); 1586 if (err < 0) 1587 goto rtnl_link_failed; 1588 1589 out: 1590 return err; 1591 1592 rtnl_link_failed: 1593 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1594 xfrm_tunnel_failed: 1595 unregister_pernet_device(&sit_net_ops); 1596 goto out; 1597 } 1598 1599 module_init(sit_init); 1600 module_exit(sit_cleanup); 1601 MODULE_LICENSE("GPL"); 1602 MODULE_ALIAS_NETDEV("sit0"); 1603